style: remove redundant PMD exclusions

[vil02]

Some of the exclusions become unnecessary.

Similar to #6209. Continuation of #5155.

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new algorithms include a corresponding test class that validates their functionality.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.32%. Comparing base (c8d0291) to head (8d7c553).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7272   +/-   ##
=========================================
  Coverage     79.32%   79.32%           
- Complexity     6989     6991    +2     
=========================================
  Files           781      781           
  Lines         22958    22958           
  Branches       4510     4510           
=========================================
  Hits          18212    18212           
- Misses         4019     4020    +1     
+ Partials        727      726    -1     

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